Perhaps you should try some spelling variations:
sang tao » hang tai
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
van hanh » van thanh, ban hanh, van anh
va thanh » gia thanh, ban thanh, va tinh
thai cua » than cua, tai cuc, tri cua
tu sach » thu sach, su sach, te sach
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
y sang » _ sang, duy sang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y sang tao boi. hieu van pham duc ((((van hanh) or (va thanh))) or (va danh)) thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y sang tao boi. hieu van pham duc ((((van hanh) OR (va thanh))) OR (va danh)) thai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y sang tao boi. hieu van pham duc ((((van hanh) or (va thanh))) or (va danh)) thai cua tre*.